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Two-Stage R-290 Liquid-to-Liquid Heat Pump Boosts Cold-Climate Heating 18%
Two-stage R-290 heat pump: 18.3% more heating capacity at -8.3°C.
Purdue built a variable-speed two-stage propane (R-290) liquid-to-liquid heat pump with independent compressor control. Published in Applied Thermal Engineering 2025.
Indirect architecture keeps flammable charge outdoors. Roadmap for where California A3 code paths may land.
Full piece at ServiceMag.
